clarify changelog entry on GitHub Enterprise import support

CHANGELOG

@@ -18,7 +18,7 @@ v 8.8.0 (unreleased)
   - Display informative message when new milestone is created
   - Allow "NEWS" and "CHANGES" as alternative names for CHANGELOG. !3768 (Connor Shea)
   - Added button to toggle whitespaces changes on diff view
-  - Backport GitLab Enterprise support from EE
+  - Backport GitHub Enterprise import support from EE
   - Create tags using Rugged for performance reasons. !3745
   - Files over 5MB can only be viewed in their raw form, files over 1MB without highlighting !3718
   - Add support for supressing text diffs using .gitattributes on the default branch (Matt Oakes)